diff --git a/.taskcluster.yml b/.taskcluster.yml
index de7bcccb..09c55abd 100644
--- a/.taskcluster.yml
+++ b/.taskcluster.yml
@@ -34,7 +34,7 @@ tasks:
           project:
               $switch:
                   'tasks_for in ["github-push", "github-release"]': '${event.repository.name}'
-                  'tasks_for[:19] == "github-pull-request"': '${event.pull_request.head.repo.name}'
+                  'tasks_for[:19] == "github-pull-request"': '${event.pull_request.base.repo.name}'
                   'tasks_for in ["cron", "action", "pr-action"]': '${repository.project}'
           head_branch:
               $switch:
diff --git a/template/{{cookiecutter.project_name}}/taskcluster.github.yml b/template/{{cookiecutter.project_name}}/taskcluster.github.yml
index 1eb29777..3076f953 100644
--- a/template/{{cookiecutter.project_name}}/taskcluster.github.yml
+++ b/template/{{cookiecutter.project_name}}/taskcluster.github.yml
@@ -32,7 +32,7 @@ tasks:
           project:
               $switch:
                   'tasks_for in ["github-push", "github-release"]': '${event.repository.name}'
-                  'tasks_for[:19] == "github-pull-request"': '${event.pull_request.head.repo.name}'
+                  'tasks_for[:19] == "github-pull-request"': '${event.pull_request.base.repo.name}'
                   'tasks_for in ["cron", "action", "pr-action"]': '${repository.project}'
           head_branch:
               $switch: